fix: linter

api/migrations/versions/563cf8bf777b_enable_tool_file_without_conversation_id.py

@@ -6,7 +6,6 @@ Create Date: 2024-03-14 04:54:56.679506
 
 """
 from alembic import op
-import sqlalchemy as sa
 from sqlalchemy.dialects import postgresql
 
 # revision identifiers, used by Alembic.

api/models/tools.py

@@ -218,7 +218,7 @@ class ToolFile(db.Model):
     # tenant id
     tenant_id = db.Column(UUID, nullable=False)
     # conversation id
-    conversation_id = db.Column(UUID, nullable=False)
+    conversation_id = db.Column(UUID, nullable=True)
     # file key
     file_key = db.Column(db.String(255), nullable=False)
     # mime type